A woman who killed garroted, stabbed and buried an autistic teenager's body in her garden has been jailed for life.

Jemma Lilley, previously of Stamford, brutally murdered Aaron Pajich as she strangled him with a wire until it broke.

Aaron Pajich was murdered by Lincolnshire's Jemma Lilley and her housemate Trudi Lenon in Western Australia (Image: Western Australia Police)

The young and twisted killer - who had an "obsession" with serial killers - then stabbed him three times before burying the 18-year-old in a shallow grave in her garden in Western Australia and covering it with concrete and tiles.

Jemma Lilley, previously of Stamford, murdered 18-year-old Aaron Pajich along with her housemate Trudi Lenon in Western Australia. Pictured is Lilley.

Lilley had wanted to tick off murder from her "bucket list" by the age of 25.

Before the murder, Lilley had written a violent novel, with one passage reportedly reading: “I feel I can’t rest until the blood of a fresh, screaming, bleeding victim is gushing out and pooling on the floor.”

Lilley was convicted alongside 43-year-old housemate Trudi Lenon at the Supreme Court of Western Australia in November.

On Wednesday, February 28, the pair were sentenced to life imprisonment with a minimum term of 28 years.

Trudi Lenon, 43, was also found guilty

Lilley was so "full of herself and euphoric" that she could not help boasting to a work colleague about the murder, prosecutor James McTaggart told the court during a four-week trial last year.

Speaking to The Times after the conviction, Lilley's stepmother, Nina Lilley, 48, said: "The book was a big problem with me. At the beginning I was, 'fair enough you want to write a horror story', but I didn't like the contents of it.

"She had always had an obsession with serial killers but she said it was a way of venting her frustration of what happened when she was a child."

Knives and scalpels were found in the house (Image: Supreme Court WA)

The victim - described by his mother as a "precious little boy" - was lured to his death on June 13, 2016, with both defendants blaming each other for the killing.

Lenon told the court Lilley approached the teenager from behind as he installed games on her computer, garroted him until the wire broke then stabbed him three times.